Clock



FIG. 1 is a front perspective view of a clock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken-line showing of FIG. 2 is environmental only and forms nopart of the claimed design.

The ornamental design for a clock, as shown and described.